Merge branch 'MDL-56959-master-fixup' of https://github.com/FMCorz/mo…

…odle
moodle · Nov 18, 2016 · ff308ab · ff308ab
2 parents cb3f673 + 755b013
commit ff308ab
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/outputlib.php b/lib/outputlib.php
@@ -2232,7 +2232,7 @@ public function get_block_render_method() {
     public function get_css_tree_post_processor() {
         $configs = [$this] + $this->parent_configs;
         foreach ($configs as $config) {
-            if ($config->csstreepostprocessor && is_callable($config->csstreepostprocessor)) {
+            if (!empty($config->csstreepostprocessor) && is_callable($config->csstreepostprocessor)) {
                 return $config->csstreepostprocessor;
             }
         }